Critical Mass: A Centre for Contemporary Art is a Port Hope-based not-for-profit arts organization. It was founded in 2012, by Aurelie Collings, Liz Parkinson, Fiona Crangle and Sarah Jacob. Together they gathered a group of curators, artists and art supporters dedicated to bringing cutting-edge contemporary art experiences to the residents of Port Hope.

In 2018, they opened the Little Station on Lent Lane in beautiful downtown Port Hope. Built in the 1850s, this historical railway station has been rehabilitated, reimagined, and repurposed as a hub for community arts engagement.